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Added ROM-bank wrapping support, making bootleg game "Pocket Monster Adventures" boot.

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(Although this game is better not booting)
This commit is contained in:
Lior Halphon 2016-04-09 02:02:40 +03:00
parent a3b44d20cb
commit 80d03f3c91
1 changed files with 5 additions and 0 deletions
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5
Core/memory.c
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@ -264,6 +264,11 @@ static void write_mbc(GB_gameboy_t *gb, unsigned short addr, unsigned char value
break; break;
} }
/* Some games assume banks wrap around. We can do this if ROM size is a power of two */
if (gb->mbc_rom_bank >= gb->rom_size / 0x4000 && (gb->rom_size & (gb->rom_size - 1)) == 0 && gb->rom_size != 0) {
gb->mbc_rom_bank %= gb->rom_size / 0x4000;
}
if (gb->cartridge_type->mbc_type != MBC5 && !gb->mbc_rom_bank) { if (gb->cartridge_type->mbc_type != MBC5 && !gb->mbc_rom_bank) {
gb->mbc_rom_bank = 1; gb->mbc_rom_bank = 1;
} }